Jack



A. C. HOPKINS.

JACK.

APPLICATION FILED MAR.I8,192I.

Patented Aug; 30, 1921.

2 SHEETS-SHEET linventor ARTHUR C. HOPKINS A. C. HOPKINS JACK.

APPLICATION HLED MAR. 18, [921.

PateritedAug. 30, 1921.

2 SHEETS-SHEET 2.

g'rmwnto'o ARTHUR [3. HOPKINS 3% ZKM aitozmq UNITED STATES.

PATENT orrie5. v

. ARTHUR c. norxiiv's, or MINNEAPOLIS, MrivivEsorA.

main object is to provide an efiicient and' practical portable jack particularly adaptable for use in garages and other places where motor vehicles are jacked up for removing and replacing tires and wheels, male ing repairs, etc. Other objects will be disclosed in the course of the following specification and illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of the jack complete. a a V Fig 2 is an enlarged top view of the jack as seen in Fig. l but with the greater portion'of the handle broken away.

Fig. 3 is a sectional view on the line 33 in Fig. 2. I

Fig. 4 is a top View of the jack, similar to Fig. 2 but with the lifting block 29 omitted.

Referring to the drawings by reference characters 5 designates the main frame of the jack, which is supported 'on'two front wheels 6 and two rear casters 7 A shaft 8,- journaled with its ends in the frame 5 extends through. and serves as a pivot for a lifting lever 9. A long-angular pipe 10 is secured by a set screw 11 in the rear end of the lever 9, and serves as the handle for manipulating the jack and for pulling and pushing it from place to place. To the for ward end of the lever 9 are pivotally secured as at 12 two upstanding pawls The upper ends of the pawls'l'g are pivotally con- I nected by links 14 to the rocker arms 15 of tripping lever 16, the latter being tiltably mounted in the frame 5 as at 17; Areversing member 18 has two fixed pins 19 and 20 which are respectively slidable in slots 21 and 22 in the lever 9. A spring 23' is fixed at one end to the pin 20, and at the other end hasa hooked shank 24L which is slidablein a hole in an upstanding pin 25 secured inthe lever 16. The rear end of the reversing member 18 issecured tothe lower end of an actuating rod 26 which extends through the handle 10 and has at itsupper end a'hand piece or knob 27 (see Fig. I w l I Specification of Letters Patent.

Application filed Mal ch 13, 1921. Serial n. 453,447.

Patented Aug. 30,

The front part of the frame 5 is provided -with' two vertical channels 28 in which is slidable a lifting block 29. A substantially U-shaped cam member 30 is .pivotally mounted at its ends in the block 29, as at 31.

by the teeth 33 of the pawls 18 when the block 29 is being raised or lowered. It may be here noted that the centers 12 and 31 are in vertical alinement, as indicated by the line 34: in Fig. 3, and that the tooth 38, in addition to its up and down movement, reciprocates forward and backward'alcross the line 3 1. 1 A standard35, having a rotatable bearing plate 36 at its upper end, is vertically slidable in the lifting block 29, and is provided with a series of notches37, in any one of which may engage a pin 88, which is spring held againstthe standard and is pro vided with a finger knob 39 so that it can be readily released when it is desired to change the height of thestandard.

' In the operation of the jack whether the weight on the plate 36- is to be raised or lowered depends on the position ofthe knob 27 on'the rod 26. lVhen the rod is pushed in the jack is in condition for lifting, but ifit is pulled out or back, as shown in the drawings, then the vehicle axle or other weight; on the bearing plate is in the lowering stage. The lowering operation consists of moving the handle 10 up and down, which action will, as will be immediately described, lower the lifting block step by step. In its downward movement, note particularlyFig.

3, the handle 10 has caused the pawl teeth 33 to raise the cam 30 off the lugs 32, and, as the handle israised the cani will come down with its fourth notches (from the top) resting on the lugs 32. hen the handle is raised a trifle higher, allowing the pawl tooth toclear itself, then.-as the rear end of the'lever 16 is heavier than the front end, it will drop down against the cross bar 40 of the main frame. This action will cause the members 15, 14 and '13 to be carried back far enough to bring the teeth'33' in aline-' mentunder the third notches (from the top) of the cam 3O, and rearward of the center line 34. When the handle 10 is then brought down again the dogs 33 raise into. engage ment with the third notches of the cam and lift the cam, and the lifting block hi h enough so that the fourth notches clear t e lugs 32. As the handle is brought still lower the pin 20 engages against the short for ward end of the lever 16. This action pushes the arms 15 and the links '14 forward snapping the teeth 33 and the cam notches engaged by them in front of the center line 3 1, thus bringing all the parts back into the position shown in Fig. 3, except that the next highest notches in the cam are now carried by the pawls 13' in readiness to be lowered on the lugs 32.

In operating the jack for an upward movement of the lifting block the knob 27 is pushed in, moving the reversing member 18 forward, the pins 19, 20 sliding in the slots 21', 22, respectively. This action will cause the spring '23 to pull on the pin 25 and constantly hold the rear or heavy end of the lever l6-yieldingly upward, and the short end down against the cross bar 11. Now with the cam resting on the lugs when the handle 10 is lifted up far enough the tendency of the spring 23 will cause a forward movement of the teeth 33 which will bring them directly under. the corresponding notches of the cam which are next below those engaged by the lugs 32, which is of course in front of the line 34. '1' hen as pressure is brought to bear down on the handle the pawl 13 raises the cam to the same position as shown in Fig. 3. lVhen the proper clearance height is reached the pin 19 engages the rear end of the tripping lever 1G and pushes it down. This, it will be understood, will pull the teeth 33, and the notches of the cam engaged by them, across and to the rear of the center line 84, and the next lower notches of the cam will then be directly above and in readiness to be lowered down upon the fixed lugs,

It will thus be understood that repetitions of the above described operations will lower or raise the lifting block 29 according to the position of the knob 27 as determined by the operator.

It is further understood that this specification and drawings are purely illustrative of my invention and shall not be interpreted in a limiting sense, but that the invention may also embody suitable modifications, provi ded, however, that such modifications come within the spirit and scope of the appended claims. Having now therefore fully shown and described my invention what I claim to be new and desire to protect by Letters Patent is:

1. A jack consisting of a portable frame, a lifting member vertically slidable' in the frame, a notched cam member pivotally se-v cured to the lifting member, a lever, comprising a handle at one end, pivotally mounted in the frame, means at the other end of the lever for engaging the cam member,

and lugs fixed in the frame, said lugs and engaging means being adapted to alternatively engage the cam member.

2. A jack consisting of a portable frame, a lifting member vertically slidable'in the frame, a notched cam member pivotally secured to the lifting member, a lever, comprising a handle at one end, pivotally mounted in the frame, pawls secured to the other end of the lever, and lugs fixed in the frame, said pawls and lugs being'adapted to alternatively engage the cam member.

3. A jack consisting of a portable frame, a lifting member vertically slidable in. the frame, a notched cam member pivotally secured to the lifting member, a lever, comprising a handle at one end, pivotally mounted in the frame, pawls secured to the other end of the lever, said pawls being adapted to engage the cam member and carry the lifting member from one elevation to another, and stationary means for supporting the lifting member at such elevations.

1. A ack consisting of a portable frame, a lifting member vertically slidable in the frame, a notched cam member pivotally secured to the lifting member, a lever, comprising ahandle at one end, pivotally mounted in the frame, pawls secured to the other end of the lever, said pawls being adapted to engage the cam member and carry the lifting member from one elevation to another, a tripping lever and operative connection between it and the pawls, and. stationary meansfor supporting the lifting member at such elevations. r

5. A jack consisting of a portable frame, a lifting member vertically movable in the frame, a lever,'having a handle at one end, pivotally mounted in the frame, pawls at the other end of the lever, a notched member secured to the lifting member and adapted to be engaged by said pawls, a tripping lever pivoted in the frame, a reversing member adapted to selectively engage either end of the tripping lever, and operative connection between the tripping lever and Said pawls. V

6 A jack consisting of a portable frame, a lifting member vertically movable in the frame, a lever, having a handle at one end,

pivotally mounted in the frame, pawls at the other end of the'lever, a notched member secured to the lifting member and adapted to be engaged by said pawls, a tripping lever pivoted in the frame, a reversing member slidably mounted longitudinally in the frame and means for selectivelyengaging it with either end of thetripping lever, and operative 'connnection between the tripping lever and said pawls.

the other end ofthe lever, a notched member secured to the lifting member and adapted to be engagedby said pawls, a tripping lever pivoted in the frame, a reversing member slidably mounted longitudinally in the frame, and means for selectively engaging it with either end of the tripping lever, a spring connection between said tripping lever and reversing member, and operative connection between the tripping lever and said pawls. I a

8. A jack consisting of a portable frame, a lifting member vertically movable in the frame, a lever pivotally mounted in the frame and comprising a handle at its rear end, pawls pivotally secured to the front end of the lever, lugs adjacent said pawls and integral with the frame,,a notched member pivotally secured to the lifting member and adapted to be carried on said lugs and pawls alternatively, and automatic means for actuating the pawls across the dead center line between the swinging centers of the pawls and notched member when thelatter is being carried by the former. a

9. A jack consisting of a portable frame, a lifting member vertically movable in the frame, a lever, havinga handle at one end,

pivotally mounted in the frame, pawls at the other end of the lever, a notched member secured to the lifting member and adapted to be engaged by said pawls, a' tripping lever pivoted in the frame, the same having its rear end heavier than its front end, a reversing member slidably mounted longitudinally in the frame and adapted to selectively engage either end of the tripping lever, spring connection between the tripping lever and the forward end of the reversing member, said connectlon belng operative when the reversing member is in forward position, and operative connection between the tripping lever and said pawls.

10. A jack consisting of a portable frame, a lifting member vertically movable in the connection between the tripping lever and the reversing member, and operative connection between the tripping lever and said 7 pawls.

11. A jack consisting of a wheel supported frame,-a lifting member vertically 'slidable in the frame, a lever pivotally mounted in the frame and comprising a handle at'its rear end, pawls pivotally secured to the front end of the lever, lugs integral with the frame, a notched cam member pivotally secured to the lifting member and adapted to be carried on said lugs and pawls alternatively, a tripping lever pivotally mounted in the frame, links connecting said pawls to upstanding arms of the tripping lever, and a reversing member adapted to selectively engage either end of the tripping lever.

; 12. A jack consisting of a portable frame, a lifting member vertically movable in the frame, a lever, having a handle at one end, pivotally mounted in the frame, pawls at the other end of the lever, a notched member secured to the lifting member and adapted to be engaged by said pawls, a tripping lee ver pivoted in the frame, the same being heavier atone end than the other, a reversing member adapted to selectively engage either end of the tripping lever, means for actuating the reversing member, a spring connection between the tripping lever and the reversing member, and operative connection between thetripping lever and said: pawls. In testimony whereof I aflix signature.

ARTHUR o. HOPKINS. 

